What payroll forms do employers need to file?

Payroll Tax Forms Employers Must File in Illinois

Employers operating in Illinois need to manage several payroll tax forms to remain compliant with state and federal requirements. Proper handling of these forms ensures accurate tax withholding, reporting, and timely payments.

Federal Payroll Tax Forms

• Form W-4: Collect from employees to determine federal income tax withholding.
• Form 941: Quarterly federal tax return reporting income taxes withheld, Social Security, and Medicare taxes.
• Form 940: Annual federal unemployment tax return (FUTA).
• Form W-2: Annual wage and tax statement provided to employees and the Social Security Administration.
• Form W-3: Transmittal form submitted with W-2s to the Social Security Administration.

Illinois State Payroll Tax Forms

• IL-W-4: Illinois Employee’s Withholding Allowance Certificate to determine state income tax withholding.
• IL-941: Quarterly Illinois Withholding Income Tax Return reporting state income taxes withheld from employees.
• IL-940: Annual Illinois Unemployment Insurance Tax and Wage Report.
• IL-W-3: Annual reconciliation of Illinois withholding tax returns.

Operational Tips for Payroll Tax Compliance in Illinois

• Maintain accurate employee withholding records: Update W-4 and IL-W-4 forms regularly to reflect changes.
• Automate payroll processing: Use payroll software to schedule timely filings and payments to avoid penalties.
• Track filing deadlines: Illinois quarterly returns (IL-941) are generally due one month after the quarter ends.
• Keep detailed records: Retain copies of all payroll tax forms and payment confirmations for at least four years.
• Coordinate with bookkeeping: Ensure payroll tax liabilities are accurately recorded in financial statements.
• Stay updated: As of 2026, verify any changes to Illinois payroll tax forms or filing procedures through the Illinois Department of Revenue and Illinois Department of Employment Security websites.